the answer is -$97 for sure.
/ h: f6 N6 P* i5.39.217.77:8898Think about it this way 公仔箱論壇, I+ ~- x! b0 ?( X- H
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
8 U: F+ T0 @7 _ Ytvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |